Table 9. Effects of starter nitrogen fertilizer on leaf photosynthetic rate at different stages (μmol CO2 m-2 s-1).
| Nitrogen treatments | V4 | R2 | R4 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 2013 | 2014 | Mean | 2013 | 2014 | Mean | 2013 | 2014 | Mean | |
| N0 | 18.79bc | 15.78b | 15.90b | 24.87a | 22.20c | 23.54b | 20.23 | 17.35c | 18.79 |
| N25 | 19.91ab | 16.84b | 17.98b | 25.06a | 22.11c | 23.59b | 20.54 | 17.53bc | 19.04 |
| N50 | 21.13a | 19.07a | 19.29a | 25.91a | 26.24a | 26.08a | 20.51 | 18.11a | 19.31 |
| N75 | 17.93c | 18.14a | 16.35b | 22.54b | 24.27b | 23.41b | 20.06 | 17.84ab | 18.95 |
| ANOVA Effect | |||||||||
| Nitrogen (N) | * | * | *** | ** | ** | *** | ns | * | ns |
| Year (Y) | *** | ** | *** | ||||||
| N×Y | * | *** | ns | ||||||
Means with same letter are not significantly different (P<0.05) using LSD Test.
***, **, *, and ns denote significance at 0.001, 0.01, 0.05 and not significant (P>0.05), respectively.